/*
 * Copyright 2019 Flipkart Internet Pvt. Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.flipkart.ohos.proteus.value;

import ohos.app.Context;

import java.util.Iterator;
import java.util.Map;

/**
 * NestedBinding
 *
 * @author adityasharat
 */

public class NestedBinding extends Binding {
    public static final String NESTED_BINDING_KEY = "@";

    private final Value value;

    private NestedBinding(Value value) {
        this.value = value;
    }

    public static NestedBinding valueOf(final Value value) {
        return new NestedBinding(value);
    }

    public Value getValue() {
        return value;
    }

    @Override
    public Value evaluate(Context context, Value data, int index) {
        return evaluate(context, value, data, index);
    }

    @Override
    public String toString() {
        return getClass().getName() + "@" + Integer.toHexString(hashCode());
    }

    private Value evaluate(Context context, Binding binding, Value data, int index) {
        return binding.getAsBinding().evaluate(context, data, index);
    }

    private Value evaluate(Context context, ObjectValue object, Value data, int index) {
        ObjectValue evaluated = new ObjectValue();
        String key;
        Value value;
        for (Map.Entry<String, Value> entry : object.entrySet()) {
            key = entry.getKey();
            value = evaluate(context, entry.getValue(), data, index);
            evaluated.add(key, value);
        }
        return evaluated;
    }

    private Value evaluate(Context context, Array array, Value data, int index) {
        Array evaluated = new Array(array.size());
        Iterator<Value> iterator = array.iterator();
        while (iterator.hasNext()) {
            evaluated.add(evaluate(context, iterator.next(), data, index));
        }
        return evaluated;
    }

    private Value evaluate(Context context, Value value, Value data, int index) {
        Value evaluated = value;
        if (value.isBinding()) {
            evaluated = evaluate(context, value.getAsBinding(), data, index);
        } else if (value.isObject()) {
            evaluated = evaluate(context, value.getAsObject(), data, index);
        } else if (value.isArray()) {
            evaluated = evaluate(context, value.getAsArray(), data, index);
        }
        return evaluated;
    }

    @Override
    public Binding copy() {
        return this;
    }
}
